Sony WRT-810A User manual

SONY.
UHF SYNTHESIZED WIRELESS MICROPHONE
WRT-810A
SERVICE MANUAL
US Model

WRT-810A
3369
Notice for customers in the U.S.A.
Use of Sony wireless devices is regulated by the Federal Communica-
tions Commission as described in Part 74 subpart H of the FCC
regulations and users authorized thereby are required to obtain an
appropriate license.
You are cautioned that any changes or modifications not expressly
approved in this manual could void your authority to operate this
equipment.
TABLE OF CONTENTS
1. OPERATION
1-1. Specifications Cee c cree ce nnc nn ee ent ecencccnenecsusvovccsccucccecncce dul
12.
Overview
cccceterscscessreccsscccccecassessssscesssscoseerscasceces
1-2
1-3. Parts Identification Comoe nee e race ence seseesevessncucessccecce 13
14. Inserting Batteries --:-::s:esssssecssssesscessveneseceseoerecees 1-3
1-5.
Changing
the
Channel
Selection
cesr:ssssceceeceseseees
14
146.
Changing
the
Input
Attenuation
Setting
«+--+
1-5
1-7. Using the Transmitter --reesscsccssesccccscccsscsccescnsceees 16
1-8. Channels and Carrier Frequencies --+rrssscccseereeeees 16
2. SERVICE INFROMATION
Q-1.
Disassembly
--sscccccesssssceceeesssscessscsssessessscesnseesseeees
22.
Precautions
on
Reassembly
23.
Note
on
Parts
Replacement
Oe
necccccsvocveecccccccascceces
2-7
2-31.
SBX1608,
E7PROM
(1C203,
CP302)
RePlaceMent
cerrerecseeessceeeccnseececeesssessecesseuseeeoees
2-7
2-4.
Precautions
on
Chip
Parts
Replacement
---++-++--:
27
3.
ELECTRICAL
ADJUSTMENTS
3-1.
Equipment
and
Tools
3-2.
Adjustment
<rrerecercersesseteeeceeeecenssesaceesecseeeevsceneeeees
3-2-1.
+5
V
(Vcc)
Regulated
Voltage
Adjustment
--
34
3-2-2.
Carrier
Frequency
Adjustment
-s-+++:++e++ssseeree
34
3-23,
Reference
Flequency
Deviation
Adjustment
---
3-5
3-24.
Maximum
Frequency
Deviation
Adjustment
---
3-5
3-25,
Distortion
Ratio
Check
B-26,
SAN
Check
«scerssccscscacccescsconsssssccsseccscscns
3-2-7,
Frequency
Characteristics
Check
-++++++++++s1++
3-7
3-28.
RF
Power
Output
Check
<s:esscesescsseessesceeseeees
3-7
3-2-9.
Tone
Signal
Check
-s++::cesssssssssesssscssscecssseesseee
38
3-2-10.
Spurious
Emissions
Check
-s-+sesssssssssssseeseseeees
38
3-2-11.
Occupied
Band
Width
Check
crsrsssssssesseeeeee
39
4.
SEMICONDUCTOR
PIN
ASSIGNMENTS
--.---------
41
5.
BLOCK
DIAGRAM,
BOARD
LAYOUT,
SCHEMATIC
DIAGRAM
AND
LEVEL
DIAGRAM
51. Block Diagram
5-2. Board Layout
5-3. Schematic Diagram
6. SPARE PARTS
SECTION 1
OPERATION
1-1. SPECIFICATIONS
Transmitter and Modulator Section
Oscillator Crystal controlled PLL synthesizer
Carrier frequencies 94 settings at 125-kHz intervals
WRT-810A (64): 770.125 to 781.875 MHz
WRT-810A (66): 782.125 to 793.875 MHz
WRT-810A (68): 794.125 to 805.875 MHz i
Tone signal 32.768 kHz
Type of emission 110KF3E
RF power output 10 mW/2.5 mW, selectable (50 ohms)
Frequency stability Within +0.005% °
Less than 2.5 pW
1/4 wavelength wire
Spurious radiation
Type of antenna
Pre-emphasis 50 us
Reference deviation +5 kHz
Maximum deviation +40 kHz
Maximum modulation frequency
15 kHz
100 Hz to 13 kHz
More than 60 dB (A-weighted, with reference
deviation at WRR-820A/840A)
Less than 1.5% (with reference deviation)
0 to 21 dB, variable in 3-dB steps
(21 dB attenuation)
Frequency response
Signai-to-noise ratio
Audio distortion
Audio attenuator
Maximum input sound pressure level
151 dB SPL
Microphone unit Uni-directional dynamic type
Power Section
Power requirements 3 V DC (two L40 (LR6) alkaline batteries)
Battery life About 8 hours at 25°C or 77°F (with Sony AM3
(LR6) alkaline batteries )
Current consumption Less than 170 mA (at 3 V)
General
Operating temperature
0°C to 50°C (32°F to 122 °F)
Storage
temperature
—
30°C
to
+60°C
(—
22°F
to
+140°F)
Dimensions
48
X
238
mm
(maximum
dia./length)
(1/6
X
9%
inches)
Weight
About
300
g
(including
batteries)
(10.5
02)
Accessories supplied Microphone holder (1)
Stand adaptor PF '/, to NS ‘/. (1)
6-1.
Exploded
View
and
Parts
List
-+---+-+ssssssecessssees
6-1
6-2.
Electrical
Parts
List
-+ss+s++sssssscssecccscessesessensscscnces
6-3
6-3.
Accessories
Supplied
tree
eee
ens
rccencesecrecersesscncnsesenees
65
1-1
rato ait Sa Ad Soke:

Frequency band
1-2. OVERVIEW
The WRT-810A is transmitter for an 800 MHz
band UHF synthesized wireless microphone system to be used for
broadcast or movie production purposes. The other system compo-
nents include the AN-820A UHF antenna, the WD-820A UHF antenna
divider, and the WRR-820A/840A UHF synthesized diversity tuner.
TV
channel Frequency (MHz)
770.125 — 775.875
WRT-810A(64)
776.125 — 781.875 WRT-820A(64)
a 782.125 — 787.875
za 794.125 — 799.875
a 800.125 — 805.875
Features
Easy selection of 94 channels
With its sophisticated phase locked loop (PLL) circuit, the unit can
operate on any one of 94 carrier frequencies in a 12 MHz frequency
band for each model, selected by a simple button operation.
Each channel is identified by a number consisting of a 2-digit TV
channel number and a 2-digit wireless microphone channel number
(example: 68-23).
See “Channels and Carrier Frequencies” on page 1-6 for more details.
WRT-810A(66)
WRT-820A(66)
WRT-810A(68)
WRT-820A(68)
Operation powered by widely available batteries
The built-in DC-DC converter allows stable operation, for up to eight
hours continuously, with just two L40 (LR6) alkaline batteries.
CPU and LCD for coordinated operation control
The built-in CPU controls the unit operation including the PLL circuit
function. The LCD shows the current channel number, the residual
battery power, the input attenuation setting, the AF input level and the
RF output.
Saved channel and input attenuation settings
The unit stores the channel and the input attenuation settings when it is
turned off. The saved settings are retained even if the batteries are
removed. Therefore, when using the unit next time, you need not
make the same settings again.
1-2
| WRT-810A
The microphone and tuners are classified by frequency
band. See the table on the next page.
A 12 MHz frequency band (or two consecutive-numbered TV channels)
is assigned to each microphone and tuner model. To
indicate the assigned frequency bands, the parenthesized numbers
following the model names in the table show the smaller of the assigned
TV channel numbers. In building up a UHF wireless microphone
system, be sure to combine a microphone and a tuner
having the same TV channel number.
WRR-820A(64)
WRR-840A(64)
WRR-820A(66)
AN-820A WD-820A
WRR-840A(66)
WRR-820A(68)
WRR-840A(68)
Highly reliable electronic attenuator
The built-in input level attenuator is adjustable in the range of 0 to 21
dB in 3 dB steps. It reduces signal distortion when an excessively
strong input signal is received.
Handy audio input switch
You can use the AF switch of the microphone as a handy audio cluding
input ON/OFF switch.
RF carrier with tone signal
The unit transmits the RF carrier accompanied by a tone signal,
enabling the tuner with a tone squelch circuit to take out only the target
audio signal received.
Wide dynamic range and low noise
The compander (compressor/expander) system enables transmission
over a wide dynamic range with minimum noise.

WRT-810A
1-3. PARTS IDENTIFICATION
Cage
Reduces noise caused
by the wind. ?
POWER switch
Setting this switch to ON puts the unit in transmission mode,
recalling the channel selection and the input attenuation setting.
Setting this switch to CFF turns off the unit, saving the
channel selection and the input attenuation setting.
RF power output select
; switch
Selects RF power output
2.5 mW or 10 mW.
; 2.5 mW: Suitable for a
working range of up to
30 m (98 feet).
10 mW: Suitable fora |
~
AF switch
Switches on and
oft the audio
input. Battery
holder
Grip
working range exceeding
30 m (98 feet).
Wire antenna
ely
Display section
AF indicator.
The indicator appears when the input
audio signal level is higher than needed
to obtain the reference deviation.
TVIATT indicator
indicates the current TV channel selection
in channe! display or channel set mode,
or the current input attenuation setting in
decibels in attenuation display/set mode.
+/~ buttons —
Use these buttons to increment or
decrement the channel selection in
channel set mode or the input attenuation
setting in attenuation display/set mode.
+/-/SET buttons
+ - ser
Bw
Use a ball-point pen or simitar instrument
to press these buttons.
RF indicator
The indicator appears when the RF carrier
is being transmitted.
CH indicator ;
indicates the current wireless microhpne
channel selection in channel display or
channel set mode. When the unit is in
attenuation display/set mode, this
indicator shows “- —".*
BATT indicator
i] The batteries are in good condition
(a): The residual battery power is below
the 50% level.
: The batteries are exhausted.
Replace them.
(When this indicator appears,
the whole display starts flashing.)
SET button
Use this button to enter channel set or
attenuation dispiay/set mode.
* The example show TV channel display on the WRT-810A (68).
1-4.
INSERTING
BATTERIES
¢
s
* lal.
*+-——— Two L40 (LR6)
alkaline batteries
Grip
+ Be sure to turn the POWER switch off before replacing the batteries.
« When the unit is turned on with batteries which are exhausted, the
BATT indicator displayed may reflect their temporarily recovered °
power which will reduce very quickly. Before starting extended
operation, replace the batteries in the unit even if the BATT indicator
shows fz] or [=]
Notes on batteries
Be sure to insert the batteries with the correct polarity.
Do not pair different types of battery.
Always replace the two batteries together.
The batteries are not rechargeable.
When keeping the unit out of use for extended periods of time,
remove the batteries to avoid leakage.
Should the batteries be found to have leaked in the unit, replace them
with new ones after carefully wiping the leakage from the battery
hoider or case.

1-5. CHANGING THE CHANNEL SELECTION
—
1 While pressing the SET button, set the POWER switch to ON
to enter channel set mode.
The current channel selection will appear on the display.
AF RF BATT
“ ae
TV/ATT CH
The example show TV channel display on the WRT-810A (68).
2 Press the + button to increment the current channel selection
or the — button to decrement it.
AF RF
wm
TV/ATT CH
BATT
POWER AF
If you keep either button pressed, the channel selection will be
incremented or decremented successively.
The setting will cycle the channel number from 68-01 through
69-47.
The
example
show
TV
channel
display
on
the
WRT-810A
(68).
1-4
WRT-810A
3 Set the POWER switch to OFF to save the selected channel
number along with the current input attenuation setting.
AF RF SATT
TV/ATT CH
* The unit cannot transmit in channel set mode.
* Make sure that the channel! selected is the same as that selected on
the WRR-820A/840A unit used in the same system.
* Depending on the noise or interference conditions, the selectable
channels may not necessarily all be usable. !f necessary, you can
determine the usable channels by stepping the channel selection
through a number of channels on the tuner with the transmitter
set to OFF. Those channels on which the RF indicator of
the tuner does not light are usable. .
If there is a TV broadcasting station nearby, to avoid possible
interference
with
broadcasing,
do
not
use
that
station's
channel.
The
unit
may
not
operate
correctly
if it
is
turned
on
again
immediately
after
turning
off
the
power
while
in
channel
set
mode. Pause
for
a
few
seconds or more before turning on the power again.

WRT-810A
1-6. CHANGING THE INPUT ATTENUATION
SETTING
You can change the input attenuation setting in 3-dB steps in the range ~
of
0
to
21
dB
v
. 2
2
Use
the
+
and
—
buttons
to
adjust
the
attenuation
setting.
Raise the setting to decrease the sound volume or lower it to increase
the sound volume, using the following procedure:
TV/ATT CH
1
When
the
current
channel
selection
is
displayed
(that
is,
when
the
unit
is in
either
channel
set
mode
or
channel
display
mode),
press
the
SET
button
to
enter
attenuation
display/set
mode.
if you keep either button pressed, the input attenuation setting
=
will
be
incremented
or
decremented
successively
until
it
AF RF BAT
reaches 0 or 21 dB.
6a’ 0 1]
TV/ATT CH
3
Press
the
SET
button
to
return
to
the
previous
mode.
The current input attenuation setting in decibels will appear on
the display.
Switching from channel set mode to attenuation display/set
mode
To
save
the
input
attenuation
setting
atong
with
the
(Channel
set
mode)
(Attenuation
display/set
mode)
pes
number
selected
in
the
preceding
channel
set
=
Set
the
POWER
switch
to
OFF.
=
a
ee
ae
5a “it 2 lap
TV/ATT CH TV/ATT CH
TV/ATT CH
*
Switching
from
channel
display
mode
to
attenuation
display/
6
Oo
fe)
set mode
ON
(Channel
display
mode)
{Attenuation
display/set
mode)
if
OFF
a
|
POWER AF
The
example
shows
TV
channel
display
on
the
WRT-81
OA(68).
*
After
entering
attenuation
display/set
mode
by
pressing
the
SET
The
example
shows
TV
channel
display
on
the
WRT-810A
(68).
button
in
channel
set
mode,
if
you
do
not
press
any
button
for
about
five
seconds,
the
unit
will
return
to
channel
set
mode
automatically.
*
The
attenuation
display/set
mode
entered
by
pressing
the
SET
button
in
channel
display
mode
will
stay
until
you
press
the
SET
button
again.
If
you
turn
off
the
unit
without
returning
to
channel
display
mode,
the
unit
saves
the
status,
so
that
it
will
enter
attenuation
display/set
mode
when
turned
on
next
time.
*
Even
if
you
keep
on
pressing
the
+
or
—
button,
the
input
attenuation
setting
does
not
cycle.
After
being
decremented
to
0
dB
or
incremented
to
21
dB,
the
setting
stays
unchanged
unless
you
change
it
in
the
reverse
direction.
TV/ATT CH TV/ATT CH

1-7. USING THE TRANSMITTER
1 Select the channel to be used.
(Use the procedure in “Changing the Channel Selection” on
page.4.)
2 Set the POWER switch to ON.
t =
|
POWER AF
3 Set the AF switch to ON.
To prevent noise generation, keep the microphones and transmitters
at least 3 m (10 feet) away from the antennas when the system is
operated using a group which allows selection of up to 11 channels,
and at least 6 m (20 feet) away when using a group which allows
selection of 12 to 19 channeis.
Ensure that the tuners set to channels not being used are either
turned off or set to the minimum output level (the LEVEL adjustment
knob set to MIN).
Turning the microphone on or off may generate some
noise. To minimize the impact of such noise, set the LEVEL
adjustment knob of the tuner being used to MIN beforehand.
Switching the unit on without checking the channel selection first may
interfere with the operation of other microphones/transmitters, if the
current setting is already being used.
| WRT-810A WRT-810A |
1-8.
CHANNELS
AND
CARRIER
FREQUENCIES
WRT-810A (64)
Frequency (MHz)
TV-64 Band
Frequency (MHz)
TV-64 Band
770.125 773.500
770.250 773.625
770.375 773.750
770.500 773.875
770.625 774.000
770.750 774.125
770.875 774.250
771.000 774.375
771.125 774.500
771.250 774.625
771.375 774.750
771.500 774.875
771.625 775.000
771.750 775.125
771.875 775.250
772.000 775.375
772.125 775.500
772.250 775.625
772.375 775.750
772.500 775.875
772.625
772.750
772.875
773.000
773.125
773.250
773.375
Frequency (MHz)
TV-65 Band
Frequency (MHz)
TV-65 Band
776.125
779.500
776.250 779.625
776.375 779.750
776.500 779.875
776.625 780.000
776.750 780.125
776.875 780.250
777.000 780.375
777.125 780.500
777.250 780.625
777.375 780.750
777.500 780.875
777.625 781.000
777.750 781.125
777.875 781.250
778.000 781.375
778.125 781.500
778.250 781.625
778.375 781.750
778.500 781.875
778.625
778.750
778.875
779.000
779.125
779.250
779.375
WRT-810A (66)
Frequency (MHz) | Frequency (MHz)
TV-66 Band Shana TV-66 Band
782.125 785.500
782.250 785.625
782.375 785.750
782.500 785.875
782.625 786.000
782.750 786.125
782.875 786.250
783.000 786.375
783.125 786.500
783.250 786.625
783.375 786.750
783.500 786.875
783.625 787.000
783.750 787.125
783.875 787.250
784.000 787.375
784.125 787.500
784.250 787.625
784.375 787.750
784.500 787.875
784.625
784.750
784.875
785.000
785.125
785.250
785.375
Frequency (MHz)
TV-67 Band
Frequency (MHz)
TV-67 Band
67-01 788.125 791.500
788.250 791.625
788.375 791.750
788.500 791.875
788.625 792.000
788.750 792.125
788.875 792.250
789.000 792.375
789.125 792.500
789.250 792.625
789.375 792.750
789.500 792.875
789.625 793.000
789.750 793.125
789.875 793.250
790.000 793.375
790.125 793.500
790.250 793.625
790.375 793.750
790.500 793.875
790.625
790.750
790.875
791.000
791.125
791250
791.375
WRT-810A (68)
Frequency (MHz)
TV-68 Band
794.125
794.250
794.375
794.500
794.625
794.750
794.875
795.000
795.125
795.250
795.375
795.500
795.625
795.750
795.875
796.000
796.125
796.250
796.375
796.500
796.625
796.750
796.875
797.000
797.125
797.250
797.375
Frequency (MHz) .
TV-69 Band
800.125
800.250
800.375
800.500
800.625
800.750
800.875
801.000
801.125
801.250
801.375
801.500
801.625
801.750
801.875
802.000
802.125
802.250
802.375
802.500
802.625
802.750
802.875
803.000
803.125
803.250
803.375
Frequency (MHz)
TV-68 Band
797.500
797.625
797.750
797.875
798.000
798,125
798.250
798.375
798.500
798.625
798.750
798.875
799.000
799.125
799.250
799.375
799.500
799.625
799.750
799.875
Frequency (MHz)
TV-69 Band
803.500
803.625
803.750
803.875
804.000
804.125
804.250
804,375
804.500
804.625
804.750
804.875
805.000
805.125
805.250
805.375
805.500
805.625
805.750
805.875

| WRT-810A WRT-810A
SECTION 2
SERVICE INFORMATION
2-1. DEASSEMBLY
GRIP
B
SWITCH
KNOB
DM
UNIT
ASSEMBLY
3P connector
Switch knob A
$ _— Switch knob B
Disconnect the 3P connector
from the EX-249 board.
Tooth pick, etc
Tweezers
EX-249 board
Stop ring removal 5 Retaining ring
tool*
+ Push the hooks on the retaining
ring with the stop ring removal
tool*
and
remove
grip
B.
DM
unit
assembly
* Stop ring removal tool: part no. J6224-470-A
ANTENNA
WINDSCREEN
ASSEMBLY
GRIP
A
Remove
the
antenna
by
pushing
it
in
direction
>
a
of
the
arrow
toward
inside
grip
B.
ree
Windscreen
‘
assembly
LR
type
small
screw
M2
x5
enna
* Required tool: LR driver (part no. J-6224-750-A)
2-1
2-2

WRT-810A WRT-810A
FRAME COVER
EX-249
BOARD
SBX1630,
VCO,
ISOLATOR,
HIC
(RF
MODULATOR)
SBX1630
ge
HIC
(RF
modulator)
EX-249
board
Frame
assembly
Lead
wire
(black)
ee
Isolator
:
LER
,
%
f
e
3
WS
Unsolder.
ie
Lead wire
(orange)
Unsolder.
SBX1608
Frame
cover
CRYSTAL
Crystal
SBX1608
ASSEMBLY
_
Disengage
the
6
hooks
holding
the
frame
cover
in
place
and
LED
cushion
)
LED
spacer
Temove the cover.
+P2x 2.2
LCD INDICATION PLATE
LCD indication plate
SBX1629 LCD
SBX1629
*
Remove
the
SBX1608
assembly
by
pulling
it
out
in
the
direction
of
the
arrow
&.
SBX1608 assembly —
SBX1608

2-2. PRECAUTIONS ON REASSEMBLY
1. ANTENNA
Pull out the antena to be
able to see this position of
the bushing.
Antenna
2. RETAINING RING
Retaining ring
Grip B
* Be sure to mount the retaining ring in the
prescribed direction.
3. DM UNIT ASSEMBLY
DM
unit
assembly
Indent
Grip
A
Protrusion
* Insert the connector for the DM unit
assembly into the 3P terminal connector
pin for grip A (EX-249 board).
* Match up the protrusion on the DM unit ass’y with
the indent on grip A. (At this time, turn the DM
unit ass’y half way so that the lead wire for the
terminal connector pin does not catch on the 3P
terminal connector pin).
2-5
| WRT-810A WRT-810A
4. FRAME ASSEMBLY
Pull out the lead wires from both ends
of the capacitor (shaded section.)
: Lead wire (orange)
Lead wire (black) —
Solder here:
Lead wire (black)
/
SIL 1P socket
Bend the
contact pin.
Bend at 90°
and solder.
Plus terminal board
Note: Do not reuse the SIL 1P
socket witch has already
been _ bent.
Ground plate
Stop rubber
Note:
Fit
the
stop
rubber
securely
into
the
groove
on
the
frame.
Precision + P2 x 2.5
5. LIQUID CRYSTAL DISPLAY (LCD)
SBX1608 assembly
Frame
Note: When trimming the contact pins, be careful not
to subject the LCD to vibrations.
6. SBX1629
SBX1629 and SBX1608 must be mounted at
Battery
coil
spring
the
interval
spacing
shown
below
:
SBX
1629
pom]
Turn twice to
SBX1629
SBX1608
SBX1608
7. HIC (RF MODULATOR) AND VCO
spring|
SBX1608 assembly
: Be careful not to let the
ground plate come in
contact with the contact
pins for the SIL socket. Note : Solder the HIC (RF modulator) and VC.
to the land for the PC board.

2-3. NOTE ON PARTS REPLACEMENT
2-3-1. SBX1608, E7PROM (C203) Replacement
The last data sent to the channel and ATT is written in
the E?7PROM (IC203). When the power is turned on initially
after the E?PROM is replaced, the channel mode (Refer to
table below.) is set automatically. In such instances, when
you turn the power off, the data will be memorized by the
E?PROM and normal operation will be enabled when the
power is turned back on.
2-7
| WRT-810A
2-4. PRECAUTIONS ON CHIP PARTS
REPLACEMENT
Tools : Soldering iron of 20 W (Use a temperature con-
troller. if possible, which can set control the iron
temperature to 270°C +10°C).
Solder (0.6 mm dia. )
Desoldering metal braid (Solder wick or equivalent)
Tweezers
Soldering conditions: Tip temperature; 270+ 10°
Within the 2 seconds.
1. To remove a resistor or capacitor, place the tip of a
soldering iron on chip parts to heat the parts, and then
move it horizontally for removal while being desoldered.
For removal of a diode or transistor, heat the one side,
with two pins, of chip parts at the same time, set the
parts up when desoldered, and remove the two pins.
And then, remove the pin on another side.
2. Absorb solder by using a desoldering metal braid to
smooth the land surface of board after removal.
3. Confirm by visual check that no pattern of the removed
chip parts is peeled off and no adjacent parts is
damaged or bridged.
4. Perform a thin pretinning on the pattern.
Place new chip parts on the pattern to solder its both
sides.
Note
@ The chip part removed should not be used again.
e When mounting the new chip part, should not shift so-
that it not short.
e Use the soldering iron verticaly as much as possible.
@ When mounting the new chip part, heat it from pattern
side. Never contact the tip of the soldering iron to the
part.

WRT-810A
SECTION 3
ELECTRICAL ADJUSTMENTS
3-1. EQUIPMENT AND TOOLS
Required Instruments
DO CURRENT METER [Rage wORA CdS
SPECTROM ANALYEER
MODULA TION HP inpat ANRITSU MS616B, HP 8901B or equivalent
. Vv
ANALYZER Frequency range: 150 kHz to 3 GHz 2
POWER METER HP 435B (with power sensor HP 8482A) or
Range: 3 uW to 100 mW .
+ POWER SENSOR equivalent
AUDIO FREQUENCY Oscillation frequency : 20 Hz to 100 kHz
OSCILLATOR Accuracy : 5%
VARIABLE Variable range : 0 to 100 dB
ATTENUATOR Variable step : 0.1 dB
HP 8903B or equivalent
HP 8903B or equivalent
Frequency characteristics: 10 Hz to 500 kHz
Measurement ranges : —90 to 52 dBm, ,
LEVEL METER HP 8903B, MEGURO MN445B or equivalent
—90 to 50 dBV
Filter : A weighted filter
Frequency : 10 Hz to 100 kHz
Measurement range : 0.1% to 100%
DISTORTION ANALYZER |) so uoment Tang : ? HP 8903B or equivalent
Accuracy : +1 dB
(20 Hz to 20 kHz)
10 Hz to 1000 MHz
10 digits
Frequency range:
Effective digits :
FREQUENCY COUNTER HP 5385A, HP 8901B or equivalent
OSCILLOSCOPE Frequency: DC to 10 MHz -
DIGITAL VOLTMETER Effective digits: 3 % digits -
Tools
eee Pea Pe eal
[henner Geamd itm SCSCS~S~S
Foust omar Seare “|S SSC*d Rw me on re |
[500 rminaoncomeaar | __~__[Refe 10 “ow w make S00 trian enn”

WRT-810A
How to Make The Output Connector Fixture 3-2. ADJUSTMENTS
Required Parts
Cable with connector (part no, 1-555-758-00) : 1 This section describes the adjustments and checks required
2P socket pin (part no. 1-566474-11) :1 to meet the specifications. Make adjustment and checks
following the procedure below.
3-2-1. +5 V (Vcc) Regulated voltage adjustment
2P socket pin
Cut off (1.566-474-11)
seco | 3-2-2. Carrier frequency adjustment
ee:
- 3-2-3. Reference frequency deviation adjustment
Cable with connector
(1-555-758-00) Solder.
3-2-4. Maximum frequency deviation adjustment
3-2-5. Distortion ratio check
How to Make 500 Q Termination Connector
Required Parts
3P socket with lead wire (part no. 1-937-845-11) :1
1 kQ 1/4 W carbon resistor (part no. 1-246-473-11) :2
3-26. S/N check
3-2-7. Frequency characteristics check
3P socket with lead wire i
(part no. 1-937-845-11) 3-2-8. RF power output check
be ee le Solder. eae
(1-246473-11) 32-9. Tone signal check
Red ite 3-2-10. Spurious emissions check
Solder.
3-2-11.
Occupied
band
width check
:

WRT-810A
Preparations Switches and Control Initial Setting
1." Remove the windscreen assembly, DM unit, grips A and ATT (input level attenuator) and CH (channel) display
B. (Refer to SECTION 2 “SERVICE INFORMATION” ATT display: 0 dB
for
removal.)
Press
the
“—”
button
to
set
0
4B.
2. Connecting the DC power supply CH display: Channel display corresponding to the table
DC current meter DC power supply
- + + —
Lead ; o———0O 0°
(added) oes, iE |
below.
e601
0 (Refer to SECTION 1 “1-5. CHANGING
THE CHANNEL SELECTION” for the
method of setting the channel.)
AF switch: OFF
Lead wire
eee
i
Lead
wire
(red)
RF
Power
output
switch:
2.5
mW
older.
Lo Lead wire (brown)
SBX1629 [6]
fo} G2]
3. Connect the output connector fixture (2P socket pin) to
the output terminal (CN302) for the SBX1608.
Output connector fixture
————_|
CN302
lee +
CN302
Adjustment Location
$BX1630 CV301 (Carrier Freq.)
SBX1608
RV601
RV101
(Ref
Freq.
RV501
(Max.
Freq.
deviation)
(+5V
Regulated
Voltage)
deviation)

3-2-1. +5V (Vcc) Regulated Voltage Adjustment
Equipment and Tools
DC power supply
DC output voltage: +3.0 Vt%3
DC current meter
Digital volt meter
Adjuster (1.8 mm) (part no. : 7-721-052-82)
Connection/Adjustment Location
Digital voltmeter
5V check land
SBX1608
RV501
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch : OFF
RF Power output switch: 2.5 mW
Adjustment Procedure
(1) Set the POWER switch on the SBX1629 to ON.
(2) Turn @RV501 and adjust the DC voltage for the 5V
check land on the SBX1608 board so that it matches
the specification below :
Specification: DC voltage for the 5 V check land
= 5,00 +0.05 Vdc
(DC current approx. 130 mA at 3 V)
Adjustment: @RV501/SBX1608
| WRT-810A
3-2-2. Carrier Frequency Adjustment
Equipment and Tools
DC power supply
DC output voltage: +3.0 Vt%
DC current meter
Frequency counter
Adjuster (1.8 mm) (part no. : 7-721-052-82)
Output connector fixture
Connections
Frequency counter
SBX1608
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch: OFF
RF Power output switch: 2.5 mW
Adjustment Procedure
(1) Connect a frequency counter to the output connector
(output connector fixture) for CN302.
(2) Adjust @CV301 so that the frequency counter reading
meets the following specification :
Specification: Carrier frequency mentioned in the
table below.
Version of
WRT-810A
WRT-810A (64) | 776.125 MHz+1 kHz (65-01ch)
WRT-810A (66) | 788.125 MHz+1 kHz (67-Olch)
WRT-810A (68) } 800.125 MHz+1 kHz (69-01ch)
Adjustment: @CV301/SBX1608
Carrier frequency
3-4

WRT-810A
3-2-3. Reference Frequency Deviation Adjustment
Equipment and Tools
DC power supply
DC output voltage: +3.0 Vt# V
DC current meter
Audio frequency oscillator
Variable attenuator
Level -meter
Modulation analyzer
MEASUREMENT: FM
MEASUREMENT RANGE: 40 kHz
(manual operation)
HPF : 50 Hz
LPF : 15 kHz for HP equipment
20 kHz for ANRITSU equipment
DE EMPHASIS : 50 uS
Adjuster (1.8 mm) (part no. : 7-721-052-82)
38P socket with lead wire (part no. : 1-937-845-11)
Connections/Adjustment Location
Modulation
analyzer
3P connector
with lead wire
Red
Output connector fixture
RV101 one Tl
$BX1608
GND
Audio frequency Variable attenuator
oscillator
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch : OFF
RF Power output switch: 2.5 mW
Adjustment Procedure
(1) Input 1 kHz, —56 dBV (-—53.8 dBm) signal to the CN101
connector.
(2) Adjust @RV101 so that the frequency deviation reading
on the modulation analyzer meets the following
specification.
Specification: Frequency deviation = +5 kHz+0.1 kHz
Adjustment: @RV101//SBX1608
3-5
3-2-4. Maximum Frequency Deviation Adjustment
Equipment and Tools
DC power supply
+3.0 Vit V
Audio frequency oscillator
DC output voltage:
Variable attenuator
Level meter
Display indication : RMS
WEIGTING : WIDE BAND (No filter)
Modulation analyzer
MEASUREMENT: FM
MEASUREMENT RANGE: 40 kHz
(manual operation)
HPF : 50 Hz
LPF : 15 kHz for HP equipment
20 kHz for ANRITSU equipment
DE EMPHASIS : 50 uS
Oscilloscope
Adjuster (1.8 mm) (part no. : 7-721-052-82)
Connections/Adjustment Location
8P connector
with lead wire
Red
Modulation
Output connector analyzer
fixture
Level meter
Oscilloscope
GND
Audio
frequency
Variable
attenuator
oscillator
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch : OFF
RF Power output switch: 2.5 mW
Adjustment Procedure
(1) Input 1 kHz, —56 dBV (—53.8 dBm) signal to the CN101
connector.
(2) Check the output level for the AF OUT terminal of the
(Check if the
deviation reading given for the modulation analyzer is
+ 5 kHz *0! liz)
modulation analyzer with a level meter.

(3) Set the SENSITIVITY adjuster for the level meter so
that the meter reads O GB.
(4) Input 1 kHz, — 20 dBV (—17.8 dBm) signal to the CN101
connector.
(5) Adjust @RV601/SBX1630 so that the level meter reads
+17.5 dB (in contrast the 0 dB reading given used in
(2) above).
Also, check that the deviation reading given by the
modulation analyzer meets the following specification :
Specification: Frequency deviation
= £365 kHz +2.5 kHz
Adjustment: @RV601/SBX1630
3-2-5. Distortion Ratio Check —
Equipment and Tools
DC power supply
DC
output
voltage:
+3.0
Vi
V
DC current meter
Audio frequency oscillator
Variable attenuator
Modulation analyzer
MEASUREMENT: FM
MEASUREMENT
RANGE:
40
kHz
(manual operation)
HPF : 50 Hz
LPF
:
15
kHz
for
HP
equipment
20 kHz for ANRITSU equipment
DE EMPHASIS : 50 uS
Distortion analyzer
Oscilloscope
3P
socket
with
lead
wire
(part
no.
:
1-937-845-11)
Connections
Modulation
analyzer
38P connector with lead wire Distortion
analyzer
Output connector
fixture
Oscilloscope
Audio frequency Variable attenuator
oscillator
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch : OFF
RF Power output switch: 2.5 mW
WRT-810A
Procedure
(1) Connect a distortion analyzer to the AF OUT terminal
of the modulation analyzer.
(2) Input 1. kHz, —56 dBV (—53.8 dBm) signal to the CN101
connector.
(3) Check that the distortion analyzer reading is less than
1.3%.
(4) Input 1 kHz, —20 dBV (-17.8 dBm) signal to the CN101
connector.
(5) Check that the distortion analyzer is less than 3%.
3-2-6. S/N Check
Equipment and Tools
DC power supply
+3.0 Vt V
Audio frequency oscillator
DC output voltage:
Variable attenuator
Level meter
Display mode: RMS
WEIGTING: WIDE BAND
Modulation analyzer
MEASUREMENT: FM
MEASUREMENT RANGE: 40 kHz
(manual operation)
HPF : 50 Hz
LPF : 15 kHz for HP equipment
20 kHz for ANRITSU equipment
DE EMPHASIS : 50 uS
Oscilloscope
Adjuster (1.8 mm) (part no. : 7-721-052-82)
Connections
3P connector
with lead wire
Red
Modulation
Output connector analyzer
fixture
Level meter
SBX1608
Oscilloscope
GND
Audio frequency Variable attenuator
oscillator
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch : OFF
RF Power output switch: 2.5 mW

WRT-810A
Procedures
(1) Input 1 kHz, —56 dBV (—53.8 dBm) signal to the CN101
connector.
(2) Set the level meter for the RMS indication.
(3) Set the SENSITIVITY adjuster for the level meter so
that the level meter reads 0 dB.
(4) Connect the 500 Q termination connector to the CN101
connector.
(5) Set the WEIGHTING for the level meter as follows.
WEIGHTING : IEC or A-weighted
(6) Check that the level meter reading is less than — 32 dB.
3-2-7. Frequency Characteristics Check
Equipment and Tools
DC power supply
+3.0 Vt% Vv
Audio frequency oscillator
DC output voltage:
Variable attenuator
Level meter
Display mode : RMS
WEIGTING : WIDE BAND
Modulation analyzer
MEASUREMENT: FM
MEASUREMENT RANGE: 40 kHz
(manual operation)
HPF : 50 Hz
LPF : 15 kHz for HP equipment
20 kHz for ANRITSU equipment
DE EMPHASIS : 50 uS
Oscilloscope
Adjuster (1.8 mm) (part no. : 7-721-052-82)
Connections
3P connector
with lead wire
Red
Modulation
Output connector analyzer
fixture
SBX1608
Oscilloscope
GND
Audio frequency Variable attenuator
oscillator
Switch and Control Setting
ATT: OdB
CH display : Same as initial setting.
(Refer to page 33.)
AF switch: OFF
RF Power output switch: 2.5 mW
Level meter
Procedures
(1) Input 1 kHz, —56 dB (—53.8 dBm) signal to the CN101
connector.
(2) Read the indication on the level meter.
(The WEIGHTING for the level meter must be set to
DIN/ AUDIO.)
(3) Set the SENSITIVITY adjuster on the level meter so
that the meter reads 0 dB.
(4) Switch the oscillation frequency for the audio frequency
oscillator from 1 kHz to 100 Hz.
(5) Check that the
—1.0 +1.0 dB).
(6) Switch the oscillation frequency for the low frequency
oscillator from 100 Hz to 10 kHz.
(7) Check that the reading for the level meter remains
within — 1.0 +1.0 dB).
reading for the level meter is
3-2-8. RF power Output Check
Equipment and Tools
DC power supply
DC output voltage: +3.0 V*%§ V
DC current meter
Power meter (using a power sensor)
Connection
Power meter
Output connector fixture
: Ul Power sensor
SBX1608
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 3-3.)
AF switch : OFF
RF Power output switch: 2.5 mW
Procedure
(1) Connect the power meter to the output connector
fixture.
(2) Set the RF power output select switch (S301) on the
SBX1608 to the 10 mW side.

CE}
SBX1608
2. aly
S
E
ea
§301
RF power output select switch
(3) Check that the reading for the power meter remains
within 10 *2 mW
(4) Set the switch (S301) of the SBX1608 to 2.5 mW.
(5) Make sure that the reading for the power meter
remains within 2.5 7% mW.
3-2-9. Tone Signal Check
Equipment and Tools
DC power supply
DC output voltage: +3.0 V?%
DC current meter
Frequency counter
Modulation analyzer
MEASUREMENT : FM
MEASUREMENT RANGE: 40 kHz
(manual operation)
HPF : 4 kHz (300 Hz*)
LPF : >20 kHz
DE EMPHASIS : 50 uS
500 Q termination connector
Output connector fixture
Connection
Modulation
analyzer
Tone signal TP land
500 Q termination
connector
Frequency counter
Switch and Control Setting
ATT: 0dB
CH display : Same as initial setting.
(Refer to page 3-3.)
AF switch : OFF
RF Power output switch: 2.5 mW
3-8
| WRT-810A
Procedures
(1) Connect a modulation analyzer to the output connector
fixture.
(2) Connect a 500 Q termination connector to the CN101
connector.
(3) Make sure that deviation reading given by the modula-
tion analyzer is within +1.7 kHz +0.5 kHz.
(On HP equipment, the HPF has a cut off 300 Hz, given
a diviation within +2.3 kHz+0.5 kHz)
(4) Connect the frequency counter to the tone signal TP
land. (Refer to the diagram below.)
[Tone signal TP land
oe ol fe Bettche mt
¢ seece =. - e
SBxi 608
(5) Check that the reading for the frequency counter
remains within 32.768 kHz +1 Hz.
3-2-10. Spurious Emissions Check
Equipment and Tools
DC power supply
DC output voltage: +3.0 Vit V
DC current meter
Spectrum analyzer
500 Q termination connector
Output connector fixture
Connections
Spectrum
analyzer
Output connector fixture
CN101
SBX1608
500 Q termination connector
Switch and Control Setting
ATE: - OdB
CH display : Same as initial setting.
(Refer to page 3-3.)
AF switch: OFF
RF Power output switch: 25 mW

WRT-810A
Procedures Switch and Control Setting
(1) Set the spectrum analyzer as below : ATT: 0dB
CENTER FREQUENCY : 1.5 GHz CH display : Same as initial setting.
REFERENCE LEVEL : 10 dBm (Refer to page 33.)
FREQUENCY SPAN: 3 GHz AF switch : ON
(300 MHz/DIV) RF Power output switch: 10 mW
RBW (resolution band width): 300 kHz
ATT: 20 dB Procedures
(2)
Check
if
the
spurious
emissions
level
for
the
spectrum
(1)
Set
the
spectrum
analyzer
as
below.
analyzer remains below —30 dBm. CENTER FREQUENCY: Frequency corresponding to
‘ the table below.
Carrier frequency
WRT-810A (MHz)
~
s048m
WRT-810A
(68)
er REFERENCE LEVEL : 10 dBm
FREQUENCY
SPAN:
500
kHz
(50
kHz/DIV)
Metre Din RBW (resolution band width): 1 kHz
VBW (Video band width) : 1 kHz
3GHz ATT: 20 dB
L5
GHz
(center
frequency)
(2)
Input
1
kHz,
—20
dBV
(—17.8
dBm)
signal
to
the
CN101
connector.
(3) Check if the band width of the signal remains below
100 kHz at the —13 dBm level line for the Spectrum
analyzer.
3-2-11. Occupied Band Width Check
Required Instruments
DC regulated voltage power source
DC output voltage: +3.0 Vit V Band width of the signal
DC ammeter
10dBm
Audio frequency oscillator
Variable attenuator
Spectrum analyzer = 18dBm line
Connections
3P
connector
with
lead
wire
;
Output
connector
fixture
Red
Spectrum
V: 10dB/DIV
analyzer H: 6OkHz/DIV
fc: center frequency
1OOKIIz
Audio frequency variable attenuator
oscillator
3-9